I think btc will reach about $500 sustained price by 2020.
I think you're wrong by several orders of magnitude in one direction or the other. i.e. $50,000 or $5.
It will never crash for obivous reasons, but 50K seems too far fetched on that limited amount of time.
My take is that by about 2025 we'll be at around 10 times the ATH (12K)And just what exactly are those obvious reasons? Of course it could fail and the price crash to almost nothing. Bitcoin is still very early in the development phase so anything could happen.
Bitcoin is binary, it will either fade to nothing or be absolutely astronomical in price.